Chuck



July 1,- 1924. 1,499,639

L. A. BURCH I CHUCK 'Filed Dec. '7, 19722 Patented July l, 1924.

emr sAras LAWRENCE A.VBURCII, 0F TAMESTOWN, NEW YQRK.

CHUCK.

Application filed December 7, 1922.

To all whom z't may concern.'

Be it known that I, LAwKaNcn A.. BURGH, a citizen of the United States, residing at Jamestown, in the county of lChautauqua and State of New York, have invented Certain new and useful Improvements in Chucks, rof which the following is a specification.

This invention has to do with improvements in tool appliances and more especially to those tool holding devices known as chucks.

The object which it is aimed to accomplished by these improvements is greater facility in the adjustment of the jaws of the chuck to quickly reach the position of and produce clamping action upon the tool or other object which is inserted into the chuck jaws.

In carrying out this end, I have provided for a dual adjustment, the one a general adjustment to bring the jaws into engaging relation to the tool, and another,

la relatively fine adjustment, for producing final clamping action.

It is further contemplatedas an important feature of my invention to provide such a construction and arrangement of jaw actuating parts that the jaws may be instantly adjusted to any size of tang within the capacity of this device through the ernployment of an interrupted thread construe-- tion which permits of sliding movement of one part with respect to the other to carry7 the jaws to gripping position preliminary tothe clamping action obtained by rotation of said parts.

With the above and other objects in view, the invention consists in certain combinations and arrangements of the parts as `will more fully appear as the description pro-.

rseeds, the novel features thereof being pointed out in the appended claims.

In the drawings:

Figure 1 is a side elevation of an embodirnent of this invention. .l

Figure 2 is a vertical sectional view.`

Figure 3 is a similar view to Figure 2, taken at right angles to the section of said figure. Y,

Figure 4 is an end elevation of the lower extremity of the chuck.

Figure 5 is a horizontal sectional view of the device. j

Figure 6 is a perspective view of the chuck holder or inner actuating member,

serial No. $05,459.

' Figure 7 is a perspective viewbfthe outer or sleeve actuating member for the jaws.

rCorresponding and like 'parts Aare referred to in the following description and indi cated in all of the views of the drawings, by like reference characters. A j

Referring to the drawing, 1 designates 'a socket or sleeve, the exterior of which is suitably knurled lin the lcustomary manner to afford adequate hand hold in the use of this device. The boreat the lower Vend ofthe sleeve is conical in form, narrowing toward the entrance, so as to produce 'a beveled camming surface la 'with whichthe jaws 2 coact. These jaws are arranged viii substantially parallel spaced relation and have their inner faces suitably serrated or toothed to obtain sufficient gripping. action upon a tool received therebetween 'toinsure against slippage. A re-bent sprihg wire 3 interposed between the ja'ws tends to hold them apart and aga-inst the 'camming surface above referred to 'and the ends of the spring are preferably secured in openings in the `jaws to preclude dis* placement of the parts. 'Dhese jaws are adjusted by two actuating parts, one the hollow core 4, which, forthe purpose of this description I termthe jaw holder, andl the other the nut or sleeve 5.l The core, which is best shown in Figure 6 is slotted the major .portion of its length so as to receive the jaws which seats inthe slots and against the init 5 at the top, asbest seen in Figure. The upper end of the core is provided with a socket 6 in which the. shank of an operating tool is posi* tioned, as set forth in the companion yaplication for Amy improvements in `combina-r tion tools,v filed December 7, 1922, Serial No. 605, 457. Exteriorly the core is formed with heavy threads 7 whichat diametrically opposite points are interrupted, the nut `ory sleeve k5 being formed with corresponding threads interiorly thereof, as indicated at 8, alsohaving opposite points of interruption., EXteriorly theV nut 5 is formed with fine threads 9 which engage corresponding threads in the upper end of the socket'l.

There are two additional features residing in the provision of a stop pin 10 at the lower end of the. core which prevents the longitudinal displaceeiitof ,the part unless the mit 5 is withdrawn, :from the sleeve l, and a stop' rib 1-1 on the interior' of the nut 5 at the end of one of the sets of threads, which limits the rota-tire movement of the core with respect to the nut and causes these parts to jointly adjust upon the socket.

`Whilc ll have shown in this embodiment an interrupted thread construction, l desire it to be understood that this is not essential, but it is preferably employed because of the additional facilityV of adjustment which is procured thereby. In other words, let us assume the tang of the tool which is to be introduced into the chuck is of relatively small diameter; it is unnecessary that the actuating nut 5 and the core 4 be screwed inwardly to bring the jaws into engagement with the tool because this may be accomplished by turning the core until these threads are disposed in the interrupted thread space of the nut (the rib ll insuring against overrunning of the rotative movement in this operation) whereupon the core may be sli-d downwardly or inwardly freely, carrying the jaws downwardly and closing them upon the tang by virtue of their contact with the camming surface la'. The clamping action may now be obtained by slight rotation of the core bringing the threads 7 and 8 into action. In just the reverse manner a very quick displacement or opening of the jaws of the tool is accomplished by disengaging the threads and slidj ing the core outwardly of the shell 1.

ln general, however, there are two main adjustments which are obtained by this construction'of differentially threaded parts 4 and 5. That is to say, when the tool is inserted between the jaws, the core 4 is first rotated to engage the jaws with the tool, followed by rotation of the nut which with its relatively iine threads secures the final clamping adjustment and securely holds the jaws at the adjusted position. One of the advantageous features of this arrangement lies in the fact that the two rotative actions of the parts 4 and 5 are really capable of attainment by actuation of one of the parts. For example, when the tool is inserted into the jaws the part 4 is rotated by a handle member and the action of the coarse threads produces-a movement of the jaws until the threads bind owing to the contact of the jaws with the shank of the y tool and continued movement of this member brings the ends of the threads 7 thereon into engagement with the rib 1l upon the nut which will Ycause the nut 5 to take up rotative movement and produce the final clamping action.

Such a tool or appliance as above described may be used in connection with braces, drills and with other implements, or machines where it is desired to employ a tool holding device, and I contemplate that the jaw holding member 4 may be suitably modified to adapt it to the particular type of device with which it is to be used without changing the essential characteristics of this invention.

Having thus described my invention, what claim as new and desire to secure by Letters Patent, is:

l. A tool holding device of the class described comprising a socket, a pair of jaws mounted therein, a jaw holder for adjusting the jaws by reciprocal movement with respect to the socket, an independent adjusting means for said jaws disposed intermediate the holder and the socket, means upon the adjusting means to engage the holder and effect joint rotation therewith, and means upon said adjusting means for its rotative adjustment relative to the socket.

2. A tool holding device of the class described comprising a socket, pair of jaws mounted therein, a slidable part coacting with the jaws for adjusting the same, a second part having threaded connection with the first part and with the socket, and means on the second part for engaging the slidable part for joint rotation in the socket whereby clamping action of the jaws may be obtained by a successive sliding and rotary movement of the parts.

3. ..4 tool holding device of the class described comprising a socket, a pair of jaws mounted therein, a slidable jaw holder for actuating the jaws to adjust the same, a nut having an interrupted threaded connection with the jaw holder for sliding movement thereof, and a continuous threadconnection with the socket for independently adjusting the jaws, and means upon the nut for limiting its rotative movement upon the holder and for engaging said holder for joint rotation,

In a tool .holder of the class described comprising a socket, a slotted jaw holder having interrupted threads upon its surface, a pair of jaws mounted therein, an adjusting nut having a continuous enteriorly threaded connection with the socket and an interrupted interior thread to receive the holder. and a stop member upon the nut to engage the holder in its rotative movement and effect joint rotation therewith in the socket.

In testimony whereof l affix my signature.

Lawnnncn a. nunon. 

